Process of preventing cores for tubular bodies from welding



P. A. E. ARMSTRONG. PROCESS OF PREVENTING CORES FOR TUBULAR BODIES FROM WELDING.

APPLICATION FILED JAN.17. 19w.

tented May 25, 1920.

INYENTOR BY W -UNlTED STATES PATENT OFFICE.

PERCY A. E. ARMSTRONG, 0F LOUDONVILLE, NEW YORK.

Specification of Letters Patent.

Patented M y 25, 1920.

Application filed January 17, 1919. .Serial No. 271,611.

To all whom it may concern:

Be it known that I, PERCY A. E. ARM-1 STRONG, a subject of the Kin of Great Britain, and a resident of oudonville, county of Albany, and State of New York, have invented certain new and useful Improvements in Processes of Preventing Cores for Tubular Bodies from Welding, of which the following is a specification.

The present invention relates to the mak ing of tubular bodies, such as steel drill rod and the like, in which a metallic core is inserted in the bore of a longitudinally bored billet and the billet and core are worked for elongation and reduction of cross section, as by rollin after which the core is withdrawn.

Accor ing to the present invention the core, which, in the case of making steel drill rod, may also he of steel preferably somewhat milder and more ductile than the drill rod steel, is coated with a layer of metal which will not melt at the temperatures used and will prevent welding taking place between the billet and core.

One metal well adapted for the purpose is nickel. The non-welding metallic layer may be applied in any desired way, as, for example, by plating it on the outer surface of the core or upon bore, or both When nickel is electro-plated on steel, for

example, a continuous coating may be readily obtained, but the bond between the steel and the nickel plate is not so stron as if the steel is first plated with copper, or ex ample, and the nickel plated upon the copper surface so obtained. Direct plating upon the steel is preferable for the present invention, since, so long as a continuous layer of non-welding metal such as nickel, is of the billet bore, welding will be prevented Irom taking place therebetween, and when it comes to withdrawingthe core, such operation ma be facilitated by the relative weakness 0 the bond between the steel and y the nickel layer.

In the accompanying drawing Figure 1 is a longitudinal sectional view of a 'longitudinally bored billet having a two-piece core therein, the core ends being shown as rojecting beyond the ends of the billet. ig.- 2 is a similar view, on an enlargzeed scale, of the billet and core of Flg. 1 a r the walls of the billetv leavingthe core end projecting for present between the core and the wall' rolling and before withdrawal of the core, andl ig. 3 is a view similar to Fig. 1, but with a one-piece core, and in this view the core ends are shown flush with the ends of the billet.

The billet 10 has a bore 11. The core portions 12 and 13 of Figs. 1 and 2, and the one-piece core 14 of Fig. 3, are shown provided with a coating 15 of metal which will notmelt at the temperatures used, as, for example, nickel preferably plated direct upon the core, though it may be applied to the bore walls or to both core and to the bore walls. To put the core in the billet the latter is preferably heated, though this is not essential. \Vhen heating is resorted to it serves to shrink the billet on the core, and further, the film of oxid formed on the bore walls serves to prevent any tendency toward union between the nickel and the iron during the rolling or other working operation. The core may be fastened in place by welding it to the billet at the end or ends, if desired. \Velding at one end is indicated at 16, Fig. 3.

After the billet and core have been worked for elongation and reduction of cross section, as by rolling, the core is pulled out, the core of ig. 2, parted between its ends, being pulled out from the o. posite ends in two parts, and the core of ig. 3 being pulled out from one end. When the core ends project beyond the billet ends they may be seized for pulling out. If the core ends do not project beyond the billet ends the tubular body produced maybe broken or cut off, pulling out, or in 'case it is a core end to be pulled through the bore of the tubular body, the cut or break may extend entirely across the end,

' having good bores of small billet and core as by v ing the elongated core from the tubular arand the like, and stron tubular bodies such as drill rod and the li (e may be produced diameter.

While the invention has been described with particular reference to the manufacture of steel drill rod, it is to be understood that the same maybe made use of in connection with the Iminufm'ture of tubular bodies of other kinds and made from a variety of materials.

I claim:

1. The process of making tubular bodies such as hollow drill rod and the. like which comprises introducing a. metallic core into a. bored billet with a layer of non-welding metallic material interposed therebetween, elongating and reducing the cross section of rolling, and withdrawticle )roduced.

2. he process of making tubular bodies such as hollow steel drill rod and the like which comprises applying a coating of nonwelding metallic materialto a metal core, introducing same into a bored billet, elongating and reducing the cross section of billet and core as by rolling, and withdrawing the core from the tubular body produced. 3. The process of making tubular bodies which comprises cmiting a steel core with nickel, introducing same in a. longitudinally bored steel billet, elongating and reducing the. cross section of billet and core as by rolling, and withdrawing the core from the tubular body produced.

#1:. The process of making tubular bodies which comprises providing a. bored billet and a core body of metallic material adaptcd to weld together, applying to the core body a coating of non-web ing metallic material, introducing the core so formed into a bored billet, elongating and rediu-im the cross section of billet and core as by ro ling, and withdrawing the core from the tubular body produced.

5. 'lhe process of making tubular bodies which comprises coating a core body with non-welding metallic material, introducing same into a bored billet of material similar to the core body. elongating and reducing the cross section of billet and core as by rolling. and withdrawing the core from the tubular body produced.

In testimony that I claim the foregoing l have hereto set my hand, this 14th day of 55 January, 1919.

PERCY A. E. ARMSTRONG. 

